User talk:Tomneils

The molar concentration of water does not belong in any equilibrium law in which water is the solvent. For any solvent, the activity is always assumed to be 1 for a dilute solution, based on Raoult's Law. If the solution is not dilute, then neither Raoult's law nor Henry's law will apply. In a concentrated solution, the activity of the solvent cannot be approximated by its mole fraction of 1, nor can the solute activities be approximated by their molar concentrations.